JP5453827B2 - Waist belt manufacturing method and disposable diaper manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a waist belt and a method for manufacturing a disposable diaper. More specifically, the replacement is easy, the leakage of excrement is less likely to occur, the absorbent main body is not easily displaced in the lateral direction, and is difficult to bite into the crotch. In addition, the present invention relates to a waist belt manufacturing method and a disposable diaper manufacturing method, which can manufacture a waist belt of a disposable diaper having a good appearance, and reduce waste in the manufacturing process.

  Conventionally, as disposable diapers, tape-type diapers, pants-type diapers, and the like are known. Tape-type diapers have the advantage that they can be easily replaced when the wearer is in a sleeping position. Specifically, since the tape can be removed from the front body, after the diaper is deployed under the body, it is worn on the body according to the wearer's body shape and fastened to the front body. be able to. Such a tape-type diaper can be easily replaced when defecation occurs. That is, since it is possible to widen (deploy) the diaper during the replacement, it is easy to clean the heel part, and the problem that the heel part becomes dirty due to the diaper replacement is less likely to occur.

  The pants-type diaper has an advantage that it can be easily replaced when the wearer is in a standing posture. And general pants-type diapers have elasticity around the abdomen and are worn with the abdomen around. Since the pants-type diaper need only be worn with the abdomen around, the trouble of adjusting the tape according to the wearer's body shape is not required as in the case of a tape-type diaper. Therefore, pants-type diapers are preferred because they are easier to replace than tape-type diapers.

  However, since the tape-type diaper and the pants-type diaper are exchanged including, for example, a non-stained exterior part, a large amount is discarded and the cost is high. Then, the disposable diaper of the type which replaces only an absorptive main part is proposed as disposable diapers other than a tape type diaper and a pants type diaper (for example, refer to patent documents 1).

JP 2000-51273 A

  Since the disposable diaper of the type described in Patent Document 1 only needs to replace the absorbent main body after urine and feces are excreted, the amount of waste is reduced compared to a tape-type diaper or a pants-type diaper. And has the advantage of being economically inexpensive. Here, even if the disposable diaper described in Patent Document 1 is used, for example, when there is a bowel movement, it is efficient to replace the wearer in a sleeping position, and it is widely performed to replace it in a sleeping position. It has been broken. This is because cleaning of the buttocks and inseam is considered.

  When exchanging diapers in such a sleeping position, the disposable diaper described in Patent Document 1 has a narrow crotch width and a small area on the back body. It sometimes spread as it leaked beyond the gathers.

  Moreover, the disposable diaper of the type described in Patent Document 1 has a problem that the absorbent main body is easily displaced in the lateral direction or easily bites into the crotch, which may cause leakage of urine, feces, and the like.

  The present invention has been made in view of the above-described problems of the prior art, is easily exchanged, is difficult to cause excrement leakage, and the absorbent main body is difficult to shift laterally and bites into the crotch. The present invention provides a waist belt manufacturing method and a disposable diaper manufacturing method which can manufacture a waist belt of a disposable diaper having a good appearance in addition to being difficult, and have little waste in the manufacturing process.

  According to this invention, the manufacturing method of the waist belt shown below and the manufacturing method of a disposable diaper are provided.

[1] A method of manufacturing a waist belt for fixing an absorbent main body to a wearer's body, the first end region including one end portion in the short direction of a belt-like long sheet and the other end region An intermediate region between the first end region and the second end region is attached to the second end region including the end portion in a stretched state along the longitudinal direction of the long sheet. In addition, a plurality of stretchable members around the leg in the stretched state are arranged so as to draw a wavy locus that does not cross each other along the longitudinal direction of the long sheet, and at least a part of the stretchable material is attached to the leg. A wavy leg-around elastic material installation region with a surrounding elastic material attached thereto, a first end side region between the leg-around elastic material installation region and the first end region, and a leg elastic material installation region Obtaining a stretchable sheet having a second end side region between the second end regions (A) Step, along the longitudinal direction of the stretchable sheet, sequentially in the order of the leg stretchable material installation region, the first end portion side region, the leg stretchable material placement region, and the second end side region The elastic sheet is cut in a continuous cutting locus so as to pass, and intermittently extending in the longitudinal direction of the first end region and the region other than the first end region. The leg is intermittently provided in the longitudinal direction in a band-shaped first intermediate sheet having a leg-forming portion pasted on the second end region and the region other than the second end region. (B) a step of obtaining a belt-shaped second intermediate sheet having a leg-surrounding portion to which a surrounding elastic material is attached, and the first end region and the second intermediate of the first intermediate sheet The second end region of the body sheet overlaps and the first intermediate sheet The first intermediate sheet and the second intermediate sheet are laminated so that the periphery forming portion and the leg periphery forming portion of the second intermediate sheet overlap, and the first periphery sheet forming portion A step (C) for obtaining a strip-shaped laminate having a joining region extending over one end region, the joining regions being arranged at predetermined intervals in the longitudinal direction, and the first intermediate of the obtained laminate The sheet and the second intermediate sheet are joined at the joining region, and a belt-like joined body having the joining region at a predetermined interval in the longitudinal direction and having a joining portion formed in the joining region is obtained. (D) A waist belt comprising: a step; and (E) a step of cutting the joining region along a trajectory along the short direction of the joined body to obtain a waist belt having the joined portions on both side portions. In the manufacturing method , the position of the continuous cutting trajectory, the expansion and contraction In the step (D), the joining portion of the joining region is one of a plurality of elastic materials around the legs, and is set to a position biased toward the other end of the long sheet constituting the material sheet. Formed by joining the first intermediate sheet and the second intermediate sheet so as to cross the entire stretchable material and to cover the entire area of the first end region, and a plurality of the first intermediate sheet and the second intermediate sheet. The region around which the other elastic members excluding the part of the elastic material around the leg are disposed is not joined without joining the first intermediate sheet and the second intermediate sheet. The manufacturing method of a waist belt .

[2] The method for manufacturing a waist belt according to [1], wherein the wavelength and phase of the continuous cutting locus are the same as the wavelength and phase of the wavy locus drawn by any of the leg-surrounding elastic members.

[3] The method for manufacturing a waist belt according to [1] or [2], wherein the leg elastic members are arranged so as to draw a sinusoidal locus, and the continuous cutting locus is a sinusoidal curve.

[4] The waist belt manufacturing method according to [1], wherein the continuous cutting locus is a linear locus parallel to a longitudinal direction of the stretchable sheet.

[5] The portion other than the portion intersecting the continuous cutting locus is pasted on the long sheet without pasting the portion intersecting the continuous cutting locus on the leg sheet of the elastic material around the legs. The manufacturing method of the waist belt in any one of [1]-[4].

[6] The method according to any one of [1] to [5], further including a step (F) of cutting the portion that intersects the continuous cutting locus of the elastic material around the legs after obtaining the elastic sheet. Waist belt manufacturing method.

[7] In any one of [1] to [6], a detachable first joint portion is disposed on one of the adjacent joint regions, and a non-detachable second joint portion is disposed on the other. Waist belt manufacturing method.

[8] A stretched state along the longitudinal direction of the long sheet in the first end region including one end portion in the short direction of the strip-shaped long sheet and the second end region including the other end portion. Affixing elastic material around the waist, and extending a plurality of elastic materials around the leg along the longitudinal direction of the long sheet in an intermediate region between the first end region and the second end region , Arranged to draw a wavy trajectory that does not cross each other, and pasted at least a part thereof, the corrugated leg elastic material installation area pasted with the leg elastic material, the leg elastic material installation area And a first end side region between the first end region and a stretchable sheet having a second end side region between the leg stretchable material installation region and the second end region ( G) along the longitudinal direction of the elastic sheet, the leg-around elastic material installation region, The first end region is formed by cutting the stretchable sheet in a continuous cutting locus that sequentially passes in the order of the first end side region, the leg-around elastic material installation region, and the second end side region. And a belt-like first intermediate sheet having a leg-forming part in which the leg-surrounding stretchable material is affixed intermittently in the longitudinal direction to a region other than the first end region, and the second A belt-like second intermediate sheet having a leg-forming portion in which the leg-surrounding elastic material is affixed intermittently in the longitudinal direction to an end region and a region other than the second end region; and (H) step, an absorber, a top sheet that is arranged to cover the surface of the absorber, and a top sheet that is at least partially made of a liquid-permeable material, and a back surface of the absorber And a backsheet made of a liquid-impermeable material, One end portion in the longitudinal direction of the body is disposed between the adjacent leg periphery forming portions of the first intermediate sheet, and the other end portion in the longitudinal direction of the absorbent main body is disposed in the second intermediate portion. (1) a step of obtaining an absorbent main body fixing body by placing and fixing between the leg periphery forming parts adjacent to the intermediate sheet, and fixing the absorbent main body so that the absorbent main body is located inside Bending the body, the first end region of the first intermediate sheet and the second end region of the second intermediate sheet overlap, the leg periphery forming portion of the first intermediate sheet and the The first intermediate sheet and the second intermediate sheet are laminated so that the leg periphery forming portion of the second intermediate sheet overlaps, and extends from the leg periphery forming portion to the first end region. A bonding region, and the bonding region has a predetermined interval in the longitudinal direction; The step (J) of obtaining the diaper laminate disposed in step (J), and joining the first intermediate sheet and the second intermediate sheet of the obtained diaper laminate in the joining region, (K) step of obtaining a diaper joined body having the joined regions at predetermined intervals in the direction and having a joined portion formed in the joined region, and the joining region of the diaper joined body in the short direction A disposable diaper comprising: a waist belt in which the joint portions are formed on both side portions, and a disposable diaper including the absorbent main body fixed to the waist belt (L). In the manufacturing method , the position of the continuous cutting locus is set to a position biased toward the other end of the long sheet constituting the stretchable sheet, and in the step (K), The joint has a plurality of front It is formed by joining the first intermediate sheet and the second intermediate sheet so as to intersect with a part of the elastic material around the leg and to cover the entire region of the first end region, and The first intermediate sheet and the second intermediate sheet for the region where the other elastic members excluding the part of the elastic material around the legs in the joining region are disposed. The manufacturing method of the disposable diaper which makes it a non-joining state, without joining .

[9] The method for manufacturing a disposable diaper according to [8], wherein the wavelength and phase of the continuous cutting locus are the same as the wavelength and phase of the wavy locus drawn by any of the leg-surrounding elastic members.

[10] The method for manufacturing a disposable diaper according to [8] or [9], wherein the leg-surrounding elastic members are arranged so as to draw a sinusoidal locus, and the continuous cutting locus is a sinusoidal curve.

  The waist belt manufacturing method of the present invention is easy to replace, the excrement is less likely to leak, the absorbent main body is difficult to shift laterally, and it is difficult to bite into the crotch. Since the belt can be manufactured and the opening around the leg is not notched in the manufacturing process, notch pieces (trims) resulting from the notch processing are not generated, and the amount of waste is reduced.

  The manufacturing method of the disposable diaper of the present invention is easy to replace, is difficult to cause excrement leakage, the absorbent main body is difficult to shift in the lateral direction, hard to bite into the crotch, and produces a good-looking disposable diaper This is advantageous in that there is little waste in the manufacturing process.

It is a top view which shows 1 process of one Embodiment of the manufacturing method of the waist belt of this invention. Is a plan view showing a step of one embodiment of a method for manufacturing a c Est belt. Is a plan view showing a step of one embodiment of a method for manufacturing a c Est belt. It is a top view which shows 1 process of one Embodiment of the manufacturing method of the waist belt of this invention. FIG. 5 is an enlarged plan view of a part of the joined body illustrated in FIG. 4. It is a plan view showing one step of another embodiment of a method of manufacturing a c Est belt. It is a plan view showing one step of another embodiment of a method of manufacturing a c Est belt. It is a top view which shows 1 process of another embodiment of the manufacturing method of the waist belt of this invention. It is a front view which shows the disposable diaper manufactured by one Embodiment of the manufacturing method of the disposable diaper of this invention. It is a top view which shows 1 process of one Embodiment of the manufacturing method of the disposable diaper of this invention. It is a top view which shows one Embodiment of the absorptive main body used for the manufacturing method of the disposable diaper of this invention. It is sectional drawing which shows the A-A 'cross section of FIG.

  Hereinafter, although the form for implementing this invention is demonstrated, this invention is not limited to the following embodiment. That is, it is understood that modifications and improvements as appropriate to the following embodiments are also within the scope of the present invention based on ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. Should be.

[1] Manufacturing method of waist belt:
The manufacturing method of the waist belt of this invention is a method of manufacturing the waist belt for fixing an absorptive main body to a wearer's body, and is provided with the following (A) process-(E) process.

  That is, the waist is stretched along the longitudinal direction of the long sheet into the first end region including one end in the short direction of the belt-shaped long sheet and the second end region including the other end. Affixing the surrounding elastic material, do not cross the elastic material around the legs in the stretched state in the middle region between the first end region and the second end region along the longitudinal direction of the long sheet Arrange the wave-like trajectory and paste at least a part of it, and attach the elastic material around the legs. (A) process to obtain a stretchable sheet having a first end portion side region therebetween and a second end side region between the leg-around stretchable material installation region and the second end portion region, and the length of the stretchable sheet Along the direction, leg stretchable area, first end side area, leg stretcher area, second end The leg circumference in which the elastic sheet is cut in a continuous cutting trajectory that sequentially passes in the order of the side areas, and the elastic material around the legs is intermittently pasted in the longitudinal direction in the area other than the first end area A leg portion in which a stretchable material around the leg is intermittently pasted in the longitudinal direction in a region other than the second end region and the band-shaped first intermediate sheet having the first end region and the forming portion (B) process which obtains the formation part and the strip | belt-shaped 2nd intermediate sheet which has a 2nd edge part area | region.

  Furthermore, in the method for producing a waist belt according to the present invention, the first end region of the first intermediate sheet overlaps with the second end region of the second intermediate sheet, and the leg periphery forming portion of the first intermediate sheet The first intermediate sheet and the second intermediate sheet are laminated so that the leg formation part of the second intermediate sheet and the second intermediate sheet overlap with each other to have a joining area extending from the leg formation part to the first end area. (C) step of obtaining a belt-like laminate in which the joining regions are arranged at predetermined intervals in the longitudinal direction, and joining the first intermediate sheet and the second intermediate sheet of the obtained laminate in the joining region Then, a step (D) of obtaining a belt-like joined body having joining regions at predetermined intervals in the longitudinal direction and having joints formed in the joining region, and the joining region in the short direction of the joined body. (E) Process of obtaining a waist belt having a joint part on both sides by cutting along a trajectory along A manufacturing method and a.

  By such a process, exchanging is easy, leakage of excrement is less likely to occur, the absorbent main body is difficult to shift laterally, and it is difficult to bite into the crotch. be able to. In addition, according to the manufacturing method of the present invention, since the opening around the leg is not cut in the manufacturing process, there is an advantage that notch pieces (trims) resulting from the notch processing are not generated and the waste is small.

  The waist belt manufactured by the manufacturing method of the waist belt of this invention is for fixing an absorptive main body to a wearer's body as mentioned above. By fixing the absorptive main body to the waist belt, it can be used as a diaper for infants or adults such as elderly people and disabled persons who need nursing care. In addition, the waist belt manufactured by the manufacturing method of the waist belt of the present invention can be used as it is after fixing the absorbent main body to the wearer, or after fixing the absorbent main body, the pants-type diaper from above Or a tape-type diaper can be used.

[1-1] Step (A):
(A) A process is a 1st end part area | region including the one edge part of the transversal direction of a strip | belt-shaped long sheet, and the 2nd end part area | region containing the other edge part along the longitudinal direction of a long sheet. In the stretched state, the elastic material around the waist is pasted, and in the middle region between the first end region and the second end region, a plurality of stretch materials around the leg are stretched along the longitudinal direction of the long sheet, Arrange the wave-like trajectories that do not cross each other, paste at least a part of them, attach the elastic material around the legs, attach the elastic material around the legs, install the elastic material around the legs This is a step of obtaining a stretchable sheet having a first end portion side region between end regions and a second end portion side region between the leg-around stretchable material installation region and the second end region.

  FIG. 1 shows the stretchable sheet 30a obtained in step (A). The elastic sheet 30a includes a strip-shaped long sheet 11, a first end region 21 including one end portion 11a in the short direction of the long sheet 11, and a second end region including the other end portion 11b. 22, the elastic material 12 around the waist is affixed in a stretched state along the longitudinal direction of the long sheet 11 (direction X in FIG. 1), and the first end region 21 and the second end region 22 In the middle region 23 between them, the stretchable material 14 around the legs in the stretched state is arranged so as to draw a wavy locus that does not cross each other along the longitudinal direction of the long sheet 11, and a part thereof Is pasted. The stretchable sheet 30a includes a corrugated leg-around elastic material installation region 23a to which the leg-around elastic material 14 is attached, and a first end portion between the leg-around elastic material installation region 23a and the first end region 21. It has a side region 23b and a second end side region 23c between the leg extension / contraction material installation region 23a and the second end region 22.

[1-1-1] Long sheet:
The long sheet is preferably made of a non-woven fabric. Examples of the non-woven fabric include a dry non-woven fabric and a wet non-woven fabric made of a thermoplastic resin such as polyethylene, polypropylene, and polyester. Specific examples include spunbond, SMS, and air-through nonwoven fabric. Among these, spunbond can be suitably used because of its high strength. Moreover, since an air through nonwoven fabric is excellent in a touch feeling, it is preferable to use it as a material for the surface (outside) of the belt-like body.

  The length of the long sheet in the short direction (the width of the long sheet) is a waist belt for adults, a waist belt for children, or a so-called middle-sized waist belt. Depending on whether or not, it can be set as appropriate. For example, in the case of an adult waist belt, the width is preferably 300 to 700 mm, more preferably 350 to 500 mm.

[1-1-2] Elastic material around waist:
The pasting position of the elastic material around the waist is a first end region including one end portion in the short direction of the long sheet and a second end region including the other end portion. That is, it is a part corresponding to the wearer's waist, and the waist elastic material is attached to all or a part of the part corresponding to the waist. By sticking at such a position, a gather (waist gather) rich in stretchability can be formed in the waist opening of the waist belt. And according to this waist gather, since it becomes difficult to form a gap around the waist when wearing a diaper, leakage of urine around the waist can be prevented. Moreover, since the fitting property of a diaper becomes favorable, the sliding-down of a diaper can be prevented.

  As the elastic material around the waist, the same elastic material used for conventional disposable diapers can be suitably used. Specifically, a flat rubber made of natural rubber, a thread rubber made of an elastic thread of synthetic rubber (urethane rubber, etc.), a stretchable net, a stretchable film, and the like can be given.

  The stretched state (stretching rate) of the elastic material around the waist is, for example, 120 to 400% when the elastic material is a rubber thread made of natural rubber or a synthetic rubber elastic thread. It is more preferable that the elongation is 200 to 300%. When the stretching rate is in such a range, a sufficient stretching force can be applied without applying an excessive tightening force to the wearer.

  Conventionally known methods can be used as a method of attaching the elastic material around the waist. For example, when natural rubber is used, first, natural rubber having a predetermined number of slits is prepared in advance. At the same time as the rubber is fed into the diaper assembling process, it is divided by the slits to obtain a waist elastic group consisting of a predetermined number of waist elastic materials. Next, a method of applying an adhesive to the obtained waist circumference stretchable material group and sticking it to a long sheet can be mentioned. As the adhesive, for example, a hot melt adhesive is preferably used. In addition to the adhesive described above, a waist elastic material (waist elastic material group) can be attached to a long sheet by a method of pressure welding using heat sealing or ultrasonic waves.

[1-1-3] Leg elastic material:
The leg-surrounding stretchable material is a stretchable material that is disposed at a site corresponding to the circumference of the wearer's leg. In the manufacturing method of the waist belt of the present invention, the leg-holes stretchable material is affixed to an intermediate region between the first end region and the second end region. At this time, it is necessary to arrange the elastic material around the legs so as to draw wavy trajectories that do not cross each other along the longitudinal direction of the long sheet.

  This leg stretchable material forms a gather (leg gather) rich in stretchability at the opening around the leg of the diaper. By forming the leg gather, a gap is hardly formed around the leg. Therefore, leakage of urine from the leg periphery opening can be effectively prevented. In addition, when the leg gather is formed, when changing the diaper, the vicinity of the crotch portion is deformed into a bowl shape, and a recess is formed. Therefore, there is an advantage that urine and body fluid accumulate in the concave portion, and the diaper can be easily replaced without spilling urine and body fluid.

  Further, according to the leg stretchable material, the front seat and the rear seat constituting the diaper (waist belt) can be contracted, and the remainder of the seat (that is, the looseness of the seat) can hardly be caused around the leg. . That is, a good-looking diaper (waist belt) can be obtained.

  The leg-stretchable material is not particularly limited as long as it is arranged so as to draw a wavy locus that does not cross each other. Examples of the wavy locus include a sine wave shape, a rectangular wave shape, a triangular wave shape, an S-curve shape, and a trapezoidal wave shape. (Substantially rectangular wave shape). Among these, it is preferable to arrange so as to draw a sinusoidal locus. A sinusoidal trajectory has the advantage that the fit of the diaper is good. FIG. 1 shows an example in which three leg elastic members 14 are attached to a long sheet 11 so as to draw sinusoidal trajectories that do not cross each other.

  In addition, in this process, although the leg periphery elastic material is affixed on an intermediate | middle area | region, it can arrange | position and affix from the intermediate | middle area to a 1st end part area | region and a 2nd end part area | region. That is, the leg-surrounding stretchable material can be disposed so as to overlap the waistline stretchable material. In addition, there are no particular restrictions on the plurality of leg elastics as long as they are arranged so as not to cross each other, and the interval between adjacent leg elastics can be set as appropriate, but it intersects with the continuous cutting locus. It is preferable that the space | interval in the part to perform is narrow compared with the said space | interval in another part.

  The ratio of the amplitude of the wavy trajectory drawn by the elastic material around the legs is preferably 10 to 80% with respect to the total length in the width direction (Y direction shown in FIG. 1) of the long sheet, and 20 to 40%. More preferably. If the amplitude ratio is less than 10%, the leg opening may be cramped. On the other hand, if it is more than 80%, the leg opening is wide (so-called high leg state), so that there is a possibility that the fixing property of the absorbent main body of the diaper described later is deteriorated.

In addition, the wavelength of the wavy locus drawn by the elastic material around the legs depends on whether it is an adult waist belt, a child waist belt, or a so-called middle-sized waist belt. Although it can set suitably, for example, in the case of a waist belt for adults, it is preferred that it is 300-1000 mm, and it is still more preferred that it is 400-600 mm.
There are no particular restrictions on the number of leg stretchable members as long as it is a plurality, but specifically, it is preferably 2 to 10 and more preferably 3 to 6. If the number is less than two, the diaper may be displaced because the leg is loosened. On the other hand, if it is more than 10, the elastic force around the legs is too strong, so when putting on a diaper, it is difficult to pull out the legs from the opening around the legs or the skin around the thighs becomes red. There is a risk of inviting.

  As the elastic material around the legs, the same elastic material used for conventional disposable diapers can be used as well as the elastic material around the waist. Moreover, the same elastic material may be used for the plurality of leg-around elastic materials, or different materials may be used. Here, the leg-surrounding stretchable material can be used by appropriately selecting its stretched state (stretching rate) and the type of stretchable material, but it is preferably determined by the position of the joint as will be described later.

  Conventionally known methods can be used as the method of attaching the leg elastics. For example, when natural rubber is used, natural rubber having a predetermined number of slits prepared in advance is prepared. At the same time as the assembly process of the diaper, it is divided by the slits to obtain a leg-surrounding elastic material group composed of a predetermined number of leg-surrounding elastic materials. Next, after applying an adhesive at a position on the long sheet where the leg elastic group is disposed, the above-mentioned leg elastic group is attached to the long sheet by the adhesive. it can. As the adhesive, for example, a hot melt adhesive can be suitably used. In addition to the adhesive described above, a leg stretchable material (a leg stretchable material group) can be affixed to the long sheet by a method such as heat sealing or ultrasonic sealing, which is performed by welding by heating and pressing.

  Here, the elastic material around the legs can paste all or part of the portion other than the portion intersecting the continuous cutting locus on the long sheet without pasting the portion intersecting the continuous cutting locus on the long sheet. preferable. With such a configuration, when the first intermediate sheet and the second intermediate sheet are obtained by cutting the elastic sheet in the step (B), the leg-around elastic material is attached to the long sheet. The part which is not inserted enters the sheet (first intermediate sheet and second intermediate sheet) by the contraction force. Therefore, it is possible to prevent the sheets (the first intermediate sheet and the second intermediate sheet) from being pulled by the leg stretchable material (the end portion of the sheet is contracted). If the sheet is pulled, gaps may be formed around the legs or the legs may be easily turned over, which may cause leakage and poor appearance.

  Moreover, an abdominal circumference stretchable material can be further affixed to the first end portion side region and the second end portion side region in a stretched state along the longitudinal direction of the long sheet. An abdominal circumference elastic material is an elastic material arrange | positioned in the site | part corresponded to a wearer's abdominal circumference. When such an abdominal circumference stretchable material is used, it is possible to further improve the fit of at least one of the first end area and the second end area and the intermediate area of the leg circumference opening of the manufactured waist belt. The position where the belly stretchable material is affixed is preferably between the waist stretchable material and the leg stretchable material, and can be arranged at a position overlapping the leg stretchable material.

  As the elastic material around the abdomen, the same elastic material that has been used in conventional disposable diapers can be used as well as the elastic material around the waist.

[1-2] Step (B):
(B) A process is continuous along the longitudinal direction of the stretchable sheet and sequentially passes in the order of the leg-surrounding stretchable material installation region, the first end side region, the leg stretchable material placement region, and the second end side region. For cutting around the leg, in which the elastic sheet is cut along the cutting trajectory, and the elastic material around the leg is intermittently attached in the longitudinal direction to the region other than the first end region and the first end region. For forming a leg circumference in which a belt-like first intermediate sheet having a portion, a second end area, and an area other than the second end area are intermittently affixed with a leg circumference elastic material in the longitudinal direction thereof And a belt-like second intermediate sheet having a portion.

  In this way, the elastic sheet is cut in its longitudinal direction to produce two intermediate sheets (first intermediate sheet and second intermediate sheet), and a waist belt is manufactured using these intermediate sheets. Then, since trim (that is, a portion to be discarded) hardly occurs during the manufacturing process, there is an advantage that the material (elastic sheet) is not easily wasted. In other words, the method of manufacturing the waist belt of the present invention does not require the steps of punching a sheet and punching holes like a conventional pant-type diaper when forming the opening around the leg. Trim is unlikely to occur in the process. Therefore, waste of raw materials can be reduced and waste can be reduced. Moreover, since there is one cutting line, there is an advantage that it is easy to apply pressure to the cutting blade that breaks the stretchable sheet and it is difficult for cutting defects to occur.

  The continuous cutting trajectory is not particularly limited as long as the above conditions are satisfied, and examples thereof include linear trajectories, sine wave shapes, rectangular wave shapes, triangular wave shapes, S-curve shapes, trapezoidal wave shapes (substantially rectangular wave shapes), and the like. Further, the continuous cutting locus may be a finer (further smaller amplitude) wave-like locus having the locus exemplified as described above as a basic line and swinging left and right around the basic line. That is, a wavy trajectory having a small amplitude is meandered in a wavy shape to make a macroscopic trajectory such as a straight line, a sine wave, a rectangular wave, a triangular wave, an S-curve, or a trapezoidal wave (substantially rectangular wave). it can. With such a trajectory, there is an advantage that the skin contact of the cut surface becomes good.

  The wavelength and phase of the continuous cutting trajectory are preferably the same as the wavelength and phase of the wavy trajectory drawn by one of the leg elastics, and the leg elastics are arranged to draw a sinusoidal trajectory. In this case, the continuous cutting locus is preferably a sinusoidal curve. If it is a sinusoidal curve, the cutting blade continuously hits the stretchable sheet, so that there is an advantage that cutting breakage hardly occurs.

  Here, in this specification, the sinusoidal trajectory drawn by the continuous cutting trajectory is a concept including a waveform like the continuous cutting trajectory S1 shown in FIG. 2, and the sine wave shape is like the continuous cutting trajectory S1. It is preferable that the portion intersecting with the leg-stretchable material has a waveform including a portion (intersecting portion M shown in FIG. 2) that is parallel or substantially parallel to the longitudinal direction of the stretchable sheet. With such a trajectory, the leg opening can be widened, so that there is an advantage that the feeling of wear is improved. FIG. 2 shows an example in which the stretchable sheet 30a is cut according to a sinusoidal curve S1 (continuous cutting locus S1).

  The continuous cutting locus is also preferably a linear locus parallel to the longitudinal direction of the stretchable sheet. Since the thigh is covered from the base of the wearer's leg by the waist belt if it is a linear trajectory, for example, even a wearer accustomed to trunks is unlikely to feel uncomfortable when wearing a diaper There are advantages. FIG. 7 shows an example in which a linear trajectory S2 is adopted as the continuous cutting trajectory.

  The continuous cutting locus is a line that divides the stretchable sheet into two along the longitudinal direction in the middle region. When the stretchable material sheet is cut along the continuous cutting locus, the two intermediate sheets ( A first intermediate sheet and a second intermediate sheet) can be obtained. And as long as the continuous cutting locus satisfies the above conditions, its position (that is, the position in the width direction of the stretchable material sheet) is not particularly limited, and may be, for example, the middle in the width direction of the stretchable material sheet. However, the position may be biased to any end in the width direction of the stretchable material sheet.

  When the position of the continuous cutting locus is the middle in the width direction of the elastic sheet, two strip-shaped intermediate sheets having the same shape (that is, the same width in the short direction) are obtained. FIG. 1 shows an example in which the position of the continuous cutting locus S1 is the middle in the width direction of the stretchable material sheet 30a. Also, if the position of the elastic material around the legs is biased, a leg gather larger than the other sheet can be formed on one sheet (preferably the rear sheet) of the obtained waist belt, so that the wearability of the diaper is improved. There is an advantage of improvement. That is, there is an advantage that the movement of the wearer's leg is not easily disturbed and the movement becomes easy. For example, FIG. 8 shows a state in which the leg-surrounding elastic material 14 is pasted in a sine wave shape and the position of the continuous cutting locus S1 is set to a position biased toward the other end 11b in the width direction of the elastic material sheet 30c. It is an example to show.

  FIG. 3 is an example showing a band-shaped first intermediate sheet 25 and a band-shaped second intermediate sheet 26. The first intermediate sheet 25 is intermittently extended in the longitudinal direction (direction X in FIG. 3) in the first end region 21 and the region other than the first end region 21. The second intermediate sheet 26 has a longitudinal direction (in the second end region 22 and regions other than the second end region 22). In the direction of X shown in FIG. 3, there is a leg-around forming portion 16 to which a leg-around elastic material 14 is intermittently attached.

[1-3] Step (C):
(C) The process includes the step of forming the periphery of the first intermediate sheet and the second intermediate sheet while the first end area of the first intermediate sheet and the second end area of the second intermediate sheet overlap. The first intermediate sheet and the second intermediate sheet are laminated so that the leg periphery forming portions overlap, and the joint region extends from the leg periphery forming portion to the first end region. This is a step of obtaining a strip-shaped laminate that is arranged at predetermined intervals in the direction. By forming such a laminated body, a waist belt (diaper) in which gathers (leg gathers) are formed in the openings around the legs can be easily produced.

  As a method of laminating the first intermediate sheet and the second intermediate sheet, for example, one of the first intermediate sheet and the second intermediate sheet may be folded as it is and overlapped with the other. One of the body sheet and the second intermediate sheet may be rotated by 180 ° on the plane and then overlapped with the other. In addition, after cutting the elastic sheet, it is necessary to move at least one of the first intermediate sheet and the second intermediate sheet in the longitudinal direction in order to overlap the first end region and the second end region. However, the amount (distance) to be moved is not particularly limited as long as the first end region and the second end region can be overlapped. Specifically, the amount (distance) to be moved may be a half-wavelength or 1.5-wavelength of a leg-hole stretchable material that draws a wavy locus.

  FIG. 3 is a plan view showing a state after the elastic sheet 30a shown in FIG. 2 is cut along the continuous cutting locus S1 to obtain the first intermediate sheet 25 and the second intermediate sheet 26. Further, an example is shown in which the second intermediate sheet 26 is moved in the longitudinal direction by a half wavelength of the leg stretchable material 14. In this step, after arranging the first intermediate sheet 25 and the second intermediate sheet 26 as shown in FIG. 3, the second intermediate sheet 26 is folded back to the first intermediate sheet 25 side, A laminated body can be obtained by laminating the intermediate sheet 26 on the first intermediate sheet 25. This laminated body has a joining region 31a (see FIG. 4) extending from the leg periphery forming portion 16 to the first end region 21, and the joining region has a predetermined interval in the longitudinal direction (direction X in FIG. 4). It is a belt-like thing arranged by.

[1-4] Step (D):
(D) A process WHEREIN: The 1st intermediate body sheet and 2nd intermediate body sheet | seat of an obtained laminated body are joined in a joining area | region, and it has a joining area | region with the predetermined space | interval in the longitudinal direction, This is a step of obtaining a band-like joined body in which a joined portion is formed.

  When joining the first intermediate sheet and the second intermediate sheet, these two intermediate sheets may be joined in a non-detachable manner or in a detachable manner. Moreover, it is good also as not making it possible to attach and detach all, but making part detachable and making the remainder detachable. Examples of the non-detachable joining method include a hot melt adhesive, a heat sealing method such as heat sealing, and a welding method using ultrasonic waves. Examples of the detachable joining method include a mechanical fastener including a hook material and a loop material, and an adhesive tape system including an adhesive tape and a receiving portion thereof.

  Furthermore, in this step, when the first intermediate sheet and the second intermediate sheet are joined, a detachable first joining portion is arranged in one joining area of the adjacent joining areas, and the other It is preferable to arrange a non-detachable second joint portion in the joint region. In this way, when the removable part (first joint part) and the non-detachable part (second joint part) are arranged, either the left or right joint part can be attached to or removed from the obtained waist belt. There is an advantage that it can be easily attached and detached by opening the side.

  FIG. 4 shows the joined body 40a obtained in this step. In the joined body 40a, the first intermediate sheet 25 and the second intermediate sheet 26 are joined in the joined region 31a, and the joined region 31a is in the longitudinal direction of the joined body 40a (direction X shown in FIG. 4). They are arranged at a predetermined interval. A pair of heat seals 31a1 spaced apart from each other is formed in the joining region 31a, and the first intermediate sheet 25 and the second intermediate sheet 26 are joined by the heat seal 31a1 (joining part). In FIG. 4, the heat seal 31a1 is drawn as a pair of rectangular shapes. However, when the heat seal 31a1 is enlarged, as shown in FIG. The heat seal may be referred to as “heat seal 31a1”.

  In addition, in order to join a 1st intermediate body sheet and a 2nd intermediate body sheet, strip shape (refer FIG. 4) may be sufficient other than a some linear heat seal, as shown in FIG. Moreover, as shown in FIG. 6, it may be a plurality of dots.

  The position of the joining portion formed in the joining region is not particularly limited, and may be formed from the leg periphery forming portion to the first end portion region (second end portion region). Specifically, it can be formed so as to extend from a part of the leg periphery forming portion to the entire region of the first end region (second end region). In the case where three leg elastic members are used, they can be formed so as to intersect with one or two leg elastic members and to cover the entire region of the first end region. And when forming so that it may cross | intersect a part among elastic materials around a leg, the area | region (Leg circumference edge area | region 116 shown in FIG. 5) including one edge part of the transversal direction of a joined body is a junction part. It is a non-joining part without forming. If there is a non-joined part in this way, the length of the leg can be increased from the abdomen, that is, the base of the wearer's leg can be covered, so that the position of the absorbent main body is stabilized and displacement is prevented. There is an advantage that can be. Moreover, the junction part may be formed in the whole region ranging from the one edge part of the transversal direction of a joined body to the other edge part.

  In addition, as above-mentioned, when forming a junction part so that it may cross | intersect one part among several leg periphery elastic materials, the leg periphery arrange | positioned at the outermost side among the leg periphery elastic materials which cross | intersect a junction part It is preferable to increase the tensile strength of the elastic material as compared with other elastic materials around the legs. Such a configuration has the advantage that the fit around the legs is improved.

  FIG. 5 is an example in which a heat seal 31a1 (joint part) is formed so as to intersect two leg stretchable members among the three leg stretchable materials, and one side in the short direction of the joined body 40b. The region including the end portion (the leg periphery end region 116 shown in FIG. 5) is a non-joined portion.

  The joined body 40b shown in FIG. 6 is an example in which a plurality of dot-shaped heat seals 31b1 are formed over the entire region from one end 42a to the other end 42b in the short direction.

  As described above, it is preferable to determine the stretched state (stretching rate) of the leg-surrounding stretchable material and the type of the stretchable material depending on the position of the joint portion. That is, it is preferable to appropriately determine whether or not the joining portion is formed over the entire region from one end portion in the short direction of the joined body to the other end portion. As described above, when the stretched state (stretching rate) of the leg stretchable material and the type of the stretchable material are determined according to the position of the joint portion, the fit around the leg can be further improved.

  For example, in the joined body 40a shown in FIG. 5, as described above, the heat seal 31a1 (joint portion) is formed so as to intersect with the two leg elastic members among the three leg elastic members. In such a joined body 40a, it is preferable that the tensile strength of the leg elastic members 14a is larger than the tensile strength of the other leg elastic members 14b.

  In order to increase the tensile strength, specifically, there is a mode in which the type of rubber is changed. More specifically, a flat rubber is used as the leg-surrounding elastic material 14a, and a rubber thread as the leg-surrounding elastic material 14b. And the like are used. Moreover, the aspect using rubber | gum thicker than the leg periphery elastic material 14b can be mentioned as the leg periphery elastic material 14a. Furthermore, the aspect which enlarges the expansion rate of the leg periphery elastic material 14a compared with the expansion rate of the leg periphery elastic material 14b is mentioned.

[1-5] Step (E):
(E) A process is a process of cut | disconnecting a joining area | region with the locus | trajectory along the transversal direction of a joined body, and obtaining the waist belt which has a junction part in both sides.

  As a method for cutting the bonding region, a conventionally known method can be adopted. For example, a cutting blade or the like can be used.

  For example, FIG. 4 shows an example in which the waist belt 10a is obtained by cutting the joining region 31a of the joined body 40a along a trajectory along the short direction of the joined body 40a. FIG. 5 is a plan view in which a part of FIG. 4 is enlarged, and the joined body 40a is cut along the division trajectory B shown in FIG. That is, the joined body 40a is cut between the pair of heat seals 31a1. When the joined body 40a is cut between the pair of heat seals 31a1 in this manner, the heat seal is difficult to be exposed at both side portions of the obtained waist belt, so that the touch is improved. Further, the waist belt 10a has an advantage that it is easy to wear because the leg opening is wide.

[1-6] Step (F):
The waist belt manufacturing method of the present invention may further include a step (F) of cutting a portion of the leg-stretchable elastic material that intersects the continuous cutting locus after obtaining the elastic sheet. By providing this step, the stretchability of the stretchable material is not expressed at the cut end portion of the cut stretchable sheet, so that the pulling can be prevented. Specific examples of the cutting method for the leg-stretchable material include a fine pattern embossing, cutting with a cutter, a cutting roll, etc., cutting with pressure, and cutting with pressure and heating. In addition, when cutting the elastic material around the legs, it is preferable to take care not to cut the elastic sheet.

  In addition, the manufacturing method of the waist belt of the present invention includes a stretchable material (a stretchable material around the waist) that is preliminarily positioned in the joining region before the first intermediate sheet and the second intermediate sheet are joined to each other to form a joint. It is preferable to cut the leg stretchable material, the belly stretchable material, etc.) and lose the stretchable force. That is, the elastic material (especially, elastic material around the legs, elastic material around the abdomen) is not contracted by the contraction force because it is given tension when being attached to the elastic sheet. However, after the elastic sheet is cut according to the continuous cutting trajectory, the leg elastic member and the belly elastic member are contracted by the elastic force. In such a case, wrinkles occur in a part of the first intermediate sheet and the second intermediate sheet (particularly, the leg periphery forming part). And when this wrinkle exists, when joining a 1st intermediate sheet and a 2nd intermediate sheet, it becomes difficult to join these stably, or it joins in the state where a wrinkle was caught. Therefore, the manufactured waist belt looks bad. Therefore, it is preferable to lose the stretching force of the stretchable material as described above.

  As the method for cutting the stretchable material, the same method as the method for cutting the leg-around stretchable material described above can be employed.

  In addition, in (A) process, when sticking the said elastic material to a long sheet, the said elastic material can also be stuck to a long sheet so that the part corresponded to a joining area | region may be a non-joining part.

[1-7] Shrinkage region and non-shrinkage region:
The waist belt manufactured by the method for manufacturing a waist belt of the present invention preferably has a contracted region contracted by a waist elastic member and a leg elastic member and a non-contracted region other than the contracted region. When such a non-shrinkable region is provided, the absorbent main body can be fixed to the non-shrinkable region. And an absorptive main part can be stably fixed to a waist belt by fixing an absorptive main part to a non-contraction field. Furthermore, since it becomes difficult to produce a clearance gap between an absorptive main body and a waist belt, there exists an advantage that the leakage of excrement can be prevented. Moreover, since the grade of the wrinkles formed in an absorptive main body is reduced when it fixes to a waist belt, it can wear comfortably and also the external appearance is preferable. In order to effectively obtain these advantages, the non-shrink region is preferably formed in a portion where the absorbent main body can be fixed.

[1-8] Broken part:
As for the waist belt manufactured by the manufacturing method of the waist belt of this invention, it is preferable that the fracture | rupture part which can fracture | rupture a waist belt is formed in the sheet | seat (belt side sheet | seat) located in a wearer's stomach side. By forming the rupture portion, it is possible to easily remove the disposable diaper by breaking the rupture portion, and there is an advantage that it does not take time to replace the disposable diaper.

  Examples of the fracture portion include a perforation and an adhesion portion. Here, in the case where the ventral sheet is formed by two or more sheet pieces, the adhesive portion is a portion where the two or more sheet pieces for forming the ventral sheet are overlapped and overlapped with each other. Refers to the part bonded by heat sealing or ultrasonic sealing.

  For example, FIG. 7 shows an example in which a perforation 37 is formed as a fracture portion on the stretchable sheet 30b. The perforation 37 is formed at a predetermined position so as to be located on the ventral side sheet when the waist belt is manufactured.

  The perforation may be formed in advance in a long sheet, or after attaching an elastic material around the waist and an elastic material around the leg to the long sheet to obtain an elastic sheet, You may form using a breaking roll. Furthermore, in addition to the forming method as described above, it may be formed in other steps.

  In addition, you may make the junction part which mutually joins a 1st intermediate sheet and a 2nd intermediate sheet function as an adhesion part. That is, when the diaper is removed by adjusting the joining force of the joining part to such an extent that the first intermediate sheet and the second intermediate sheet can be peeled off, The second intermediate sheet can be pulled apart. In such a case, the joint portion can be used as an adhesive portion.

[1-9] Concave and convex portions:
The waist belt manufactured by the method for manufacturing a waist belt of the present invention has at least one of a concave portion recessed in the thickness direction of the waist belt and a convex portion protruding in the thickness direction of the waist belt on the inner surface thereof. Preferably it is formed.

  If at least one of these concave and convex portions is formed, the contact area between the wearer's skin and the waist belt is reduced, preventing skin troubles such as rashes even when worn for a long time. There is an advantage that you can.

  The cross-sectional shape of the recess perpendicular to the thickness direction of the waist belt can be, for example, a circle, an ellipse, a triangle, a quadrangle, or a polygon. Further, the recess may be a groove.

  The manufacturing method of the waist belt of the present invention may use a belt-like long sheet in which concave portions are formed in advance. The long sheet in which this recessed part was formed can be manufactured by embossing a long sheet. As another manufacturing method, it can also manufacture by laminating | stacking other strip | belt-shaped nonwoven fabric which has a through-hole on one strip | belt-shaped nonwoven fabric which does not have a through-hole.

  Examples of the shape of the convex portion include a hemispherical shape, a cylindrical shape, a cubic shape, and a polygonal column shape. In addition, for example, when the convex portion is formed by a multi-columnar body such as a quadrangular column, the multi-columnar body may be arranged so that the central axis in the longitudinal direction is parallel to the inner surface of the waist belt, or It may be arranged to become.

  It is preferable to form a recessed part and a convex part in the sheet | seat (back side sheet | seat) located in a wearer's back side. In the sitting position, the back seat is sandwiched between the back of the chair or wheelchair and the wearer, and is often pinched between the bedding and the wearer during sleep. It is easy to sweat on the seat side (back side). Therefore, if a gap is formed between the skin and the back sheet by forming a recess or a protrusion on the back sheet, it becomes difficult to sweat and skin troubles can be reduced.

  In addition, although a recessed part and a convex part may be previously formed in a elongate sheet as mentioned above, you may form in any process of the (B)-(E) process. For example, the concave portions can be formed by embossing predetermined portions of the first intermediate sheet and the second intermediate sheet after obtaining the first intermediate sheet and the second intermediate sheet.

[1-10] Through hole:
The waist belt manufactured by the method for manufacturing a waist belt according to the present invention preferably has a through hole. By forming the through hole, there is an advantage that the breathability of the waist belt can be improved. That is, even when worn for a long time, it is difficult to get stuffy, and skin troubles such as scabs can be prevented.

  Examples of the shape of the through hole include a circle, an ellipse, a triangle, a quadrangle, and a polygon.

  FIG. 7 shows an example in which a plurality of through-holes 39 are formed in the stretchable sheet 30b, and these through-holes 39 are positioned in the ventral side seat and the back side seat when the waist belt is manufactured. Are formed at predetermined positions.

  The waist belt manufacturing method of the present invention can use a long sheet in which through holes are formed in advance. That is, by forming a through-hole at a predetermined position of a strip-shaped long sheet made of nonwoven fabric, and pasting the stretchable material around the waist and the stretchable material around the leg to the elongated sheet formed with the through-hole An elastic sheet can be obtained. As a method for making a through-hole in a nonwoven fabric, methods, such as a hot needle, an embossing roll, a hot air, and a water jet, can be mentioned, for example.

  In addition, although it is preferable to perform the manufacturing method of the waist belt of this invention in order of (A)-(F) process, there is no restriction | limiting in particular in the order which performs each process. For example, after obtaining a laminated body by (C) process, this laminated body is cut | disconnected in a predetermined position along the transversal direction, and the process of obtaining the substantially strip | belt-shaped laminated sheet which consists of a front sheet | seat and a rear sheet | seat. The waist belt can also be obtained by joining the front sheet and the rear sheet to each other at both ends in the longitudinal direction of the obtained laminated sheet.

[2] Disposable diaper manufacturing method:
The manufacturing method of the disposable diaper of this invention is equipped with each process of the following (G) processes-(L) processes.

  That is, the waist is stretched along the longitudinal direction of the long sheet into the first end region including one end in the short direction of the belt-shaped long sheet and the second end region including the other end. Affixing the surrounding elastic material, do not cross the elastic material around the legs in the stretched state in the middle region between the first end region and the second end region along the longitudinal direction of the long sheet Arranged to draw a wavy trajectory and pasted at least part of it, attached wavy leg elastic material, attached leg elastic material, this leg elastic material installation area and first end area (G) step of obtaining a stretchable sheet having a first end portion side region between and a leg end stretchable material installation region and a second end portion region between the second end portion regions. .

  And the manufacturing method of the disposable diaper of this invention is along the longitudinal direction of an elastic sheet, and the leg circumference elastic material installation area | region, the 1st end part side area | region, the leg circumference elastic material installation area | region, and the 2nd edge part side area | region in order. The elastic sheet is cut along a continuous cutting trajectory that sequentially passes, and leg elastics are affixed intermittently in the longitudinal direction to the first end region and other regions than the first end region. The belt-shaped first intermediate sheet having a leg-forming portion attached, the second end region, and a region other than the second end region are intermittently stretchable around the leg in the longitudinal direction. (H) step of obtaining a belt-like second intermediate sheet having a leg-forming part attached thereto, an absorbent body, and a surface of the absorbent body. A top sheet made of a permeable material and the back surface of the absorber are covered. And one end in the longitudinal direction of the absorbent main body having a back sheet made of a liquid-impermeable material, and arranged between adjacent leg-forming portions of the first intermediate sheet, and absorbency (I) process which arrange | positions the other edge part of the longitudinal direction of a main body between the adjacent leg periphery formation parts of a 2nd intermediate sheet, and fixes and obtains an absorptive main body fixing body. .

  Furthermore, the manufacturing method of the disposable diaper of the present invention folds the absorbent main body fixing body so that the absorbent main body is located on the inner side, and the first end region of the first intermediate sheet and the second intermediate sheet. Laminating the first intermediate sheet and the second intermediate sheet so that the two end regions overlap and the leg forming part of the first intermediate sheet and the leg forming part of the second intermediate sheet overlap. And (J) a step of obtaining a diaper laminate having a joining region extending from the leg-forming portion to the first end region, wherein the joining regions are arranged at predetermined intervals in the longitudinal direction, and for the obtained diaper A diaper in which a first intermediate sheet and a second intermediate sheet of a laminate are joined in the joining region, and joining regions are formed at predetermined intervals in the longitudinal direction, and joining portions are formed in the joining region. (K) process of obtaining a bonded body for use, and the above-mentioned bonding region is a diaper. (L) step of obtaining a disposable diaper comprising a waist belt having joints formed on both side portions and an absorbent main body fixed to the waist belt by cutting along a trajectory along the short direction of the joined body. I have.

  According to such a process, it is easy to exchange, it is difficult to cause excrement leakage, the absorbent body is difficult to shift laterally, and it is difficult to bite into the crotch, and it is possible to manufacture a disposable diaper that looks good And there is an effect that there is little waste in the manufacturing process.

  FIG. 9 is a front view showing a disposable diaper 100 manufactured by an embodiment of the manufacturing method of the disposable diaper of the present invention. A disposable diaper 100 shown in FIG. 9 is manufactured by the waist belt manufacturing method of the present invention (specifically, manufactured using the stretchable sheet 30c shown in FIG. 8), and the waist belt. And an absorbent main body 60 fixed inside 10c. The waist belt 10c has a cylindrical shape including an abdominal side seat 35 and a back side seat 36, and joint portions 31a1 are formed on both side portions. The waist elastic member 12 is disposed in the waist opening 44, and the leg elastic material 14 is disposed in the leg opening 45.

  As for the waist belt 10c of the disposable diaper 100 shown in FIG. 9, the leg periphery shrinkage | contraction material is arrange | positioned deeply in the wearer's leg circumference rear side (namely, leg circumference shrinkage material is arrange | positioned in the wide range compared with the front side), Since the leg-shrinking material is arranged shallowly on the front side of the wearer's leg (that is, the leg-shrinking material is arranged in a narrower range than the rear side), the wear feeling is good and the wearer There is an advantage that it is difficult to disturb the movement of a person's leg and is easy to move.

[2-1] Step (G), Step (H):
The steps (G) and (H) of the method for manufacturing a disposable diaper of the present invention can employ the same steps as the steps (A) and (B) of the method for manufacturing a waist belt of the present invention, respectively. In addition, it is preferable that the leg elastic members are arranged so as to draw a sinusoidal locus. Thus, when an elastic material around the leg is arranged, there is an advantage that the fit around the leg of the wearer is improved.

  Further, the wavelength and phase of the continuous cutting locus are preferably the same as the wavelength and phase of the wavy locus drawn by any leg stretchable material, so that the leg stretchable material draws a sinusoidal locus. When arranged, the continuous cutting locus is preferably a sinusoidal curve. With such a configuration, there is an advantage that the touch becomes good.

[2-2] Step (I):
(I) A process is arrange | positioned so that the absorber and the surface of this absorber may be coat | covered, the top sheet which consists of a liquid-permeable material at least one part, and the back surface of an absorber may be coat | covered, liquid One end in the longitudinal direction of the absorbent main body having a back sheet made of an impermeable material is disposed between the adjacent leg-forming portions of the first intermediate sheet, and the length of the absorbent main body It is the process of arrange | positioning and fixing the other edge part of a direction between the adjacent leg periphery formation parts of a 2nd intermediate body sheet, and obtaining an absorptive main body fixing body.

  In the step (I), the absorbent main body may be completely fixed to both the first intermediate sheet and the second intermediate sheet, i.e., non-detachable, or completely (non-detachable) on one sheet. It may be fixed to the other sheet so as to be detachable. Moreover, you may fix to both so that attachment or detachment is possible.

  FIG. 10 shows that one end portion 60a in the longitudinal direction of the absorbent main body 60 is disposed between the adjacent leg periphery-forming portions 16a and 16a of the first intermediate sheet 25 and the longitudinal direction of the absorbent main body 60. The absorbent main body fixing body 50 obtained by arranging and fixing the other end portion 60b of the second intermediate sheet 26 between the adjacent leg periphery forming portions 16b, 16b is shown.

  In addition, when an absorptive main body is fixed to a 1st intermediate body sheet and a 2nd intermediate body sheet | seat, it is preferable to fix to the non-shrink area | region (area | region where the elastic material is not arrange | positioned) which these have. When the absorbent main body is fixed to the non-shrinkable region, there is an advantage that it is stably fixed to the waist belt. Moreover, since it is hard to produce a clearance gap between an absorptive main body and a waist belt, there exists an advantage that the leakage of excrement from the said clearance gap can be prevented.

[2-2-1] Absorber:
The absorber is a member for absorbing and holding the wearer's urine. Since the absorbent body needs to absorb and hold the wearer's urine and body fluid, the absorbent body is made of an absorbent material.

  Examples of the absorbent material constituting the absorbent body include conventionally known absorbent materials that are usually used in conventional disposable diapers, such as fluff pulp, superabsorbent polymer (hereinafter referred to as “SAP”), A hydrophilic sheet etc. can be mentioned. As the fluff pulp, it is preferable to use a cotton pulp or non-wood pulp defibrated, and as the SAP, it is preferable to use sodium polyacrylate, and as the hydrophilic sheet, tissue, absorbent paper, It is preferable to use a nonwoven fabric subjected to a hydrophilic treatment.

  These absorbent materials are usually used as a single-layer or multi-layer mat. Under the present circumstances, an absorptive material may be used individually by 1 type, and may use 2 or more types. Among these, what uses about 10-500 mass parts SAP with respect to 100 mass parts of fluff pulp is preferable. In addition, SAP may be mixed uniformly in each mat | matte of fluff pulp, and may be arrange | positioned at the layer form between the layers of the multilayer fluff pulp.

  The absorber is interposed between the top sheet and the back sheet by being sandwiched between the top sheet and the back sheet and sealing the peripheral edge thereof. Therefore, the flap part in which the absorber is not interposed between the top sheet and the back sheet is formed in the peripheral part of the absorber.

  It is preferable that the absorber is entirely wrapped with a hydrophilic sheet. With such a configuration, there is an advantage that SAP can be prevented from leaking from the absorber and shape stability can be imparted to the absorber.

  Although there is no restriction | limiting in particular in the shape of an absorber, The shape used for the conventional disposable diaper, for example, rectangular shape, an hourglass type, a gourd type, a T shape etc. can be mentioned.

  In addition, a sheet (second sheet) for diffusing liquid such as urine and body fluid may be incidentally disposed on the surface side of the absorber (for example, between the absorber and the top sheet). . When using this second sheet, due to the posture of the wearer and the like, even when the space on the back side of the top sheet is not sufficiently formed, the absorption rate of excrement such as urine and body fluid is difficult to decrease, Leakage of excrement can be prevented due to a decrease in absorption rate.

  Examples of the material constituting the second sheet include hydrophilic and liquid-permeable materials such as woven fabric, non-woven fabric, porous plastic, and fluff pulp. Examples of these constituent materials include polypropylene, polyethylene, polyester, rayon, pulp, and composite fibers thereof. As the pulp, crimped fibers such as curly cellulose fibers can be suitably used.

[2-2-2] Top sheet:
A top sheet is a sheet | seat arrange | positioned so that the surface (surface of the wearer side at the time of wear) of an absorber may be coat | covered. And since it is necessary for a top sheet to absorb excretion, such as a wearer's urine, an at least part (all or a part) is comprised with a liquid-permeable material. The liquid permeable material is usually disposed in the vicinity of the surface of the absorber, but may be disposed in the entire top sheet.

  Examples of the liquid permeable material constituting the top sheet include a woven fabric, a nonwoven fabric, and a porous film. Among these, it is preferable to use a non-woven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, nylon (registered trademark) or the like and subjected to a hydrophilic treatment. Although there is no restriction | limiting in particular in the kind of nonwoven fabric, The conventionally well-known nonwoven fabric manufactured by various manufacturing methods, such as air through (card hot air), card | curd embossing, and a spun bond, can be used conveniently.

[2-2-3] Backsheet:
A backsheet is a sheet | seat arrange | positioned so that the back surface (surface of the wearer's clothing side at the time of wear) may be coat | covered. And this back sheet | seat is comprised with the liquid impervious material in order to prevent that a wearer's urine will leak to the diaper exterior.

  There is no restriction | limiting in particular about the arrangement | positioning method of a back sheet, It can arrange | position so that it may correspond with a top sheet. From the viewpoint of using a back sheet in order to prevent leakage of urine absorbed by the absorber, it may be disposed at least in a portion where the absorber exists.

  Examples of the liquid-impermeable material constituting the back sheet include a liquid-impermeable film made of a resin such as polyethylene. Among these, it is preferable to use a microporous polyethylene film. This microporous polyethylene film has a large number of fine pores of 0.1 to several μm, and is liquid impervious but has moisture permeability, so it can prevent stuffiness inside the disposable diaper. There are advantages.

[2-2-4] Solid gathering:
The absorbent main body can be provided with a three-dimensional gather to prevent side leakage of urine excreted by the wearer. The three-dimensional gather is a member for preventing side leakage of the urine excreted by the wearer, and is a leak-proof wall configured to stand up three-dimensionally. By forming such a three-dimensional gather, the three-dimensional gather becomes a breakwater, and leakage from a leg opening or the like of a disposable diaper (so-called “lateral leakage”) can be effectively prevented.

  The structure used for the conventional disposable diaper can be employ | adopted for the structure of a three-dimensional gather. For example, a material in which a three-dimensional gathering elastic material is arranged on a part of the water-repellent sheet material, and the gathering material is formed on the sheet material by the three-dimensional gathering elastic material. The three-dimensional gather may be formed of a sheet material that is completely different from the top sheet or the back sheet, but may be formed by folding the top sheet or the like.

  In order to prevent leakage from the crotch part, this three-dimensional gather may be formed at least in the center part (inseam part) in the longitudinal direction of the absorbent main body, but extends over both ends in the longitudinal direction of the absorbent main body. It may be formed. Note that at least one pair of solid gathers must be formed, but two or more pairs may be formed.

  The three-dimensional gather may be an inversion gather that tilts toward the inside of the disposable diaper, or may be an outside gather that tilts toward the outside of the disposable diaper. Further, a three-dimensional gather (a so-called C-fold gather, Z-fold gather, or the like) in which a bent portion or a folded portion is formed in a part of the height direction can also be used.

[2-2-5] Leg gather:
An absorptive main body can also be equipped with a leg gather in the both-sides edge of the solid gathers. Leg gathers are a sheet material (absorbent body) using a stretchable elastic material (extractable material for leg gathers) in an expanded state between the side sheet and the back sheet, and utilizing the force (shrinking force) that the elastic elastic material shrinks. It is a gather that is formed. This gather is in a stretched state when worn compared to the most contracted state. Therefore, at the time of wearing, the contraction force of the elastic elastic material is applied around the wearer's leg and tightens around the wearer's leg. Furthermore, a leg gather can absorb the dimensional change around the leg of an absorptive main body which generate | occur | produces with exercise | movement (movement) of a leg, and can make an absorptive main body fit a wearer.

  FIG. 11 shows the absorbent main body 60 in which the leg gathers stretchable material 55 is arranged in the stretched state on both sides of the three-dimensional gather 52 and outside the absorber 54, and the leg gathers stretchable material 55 is in the most stretched state. Is shown. FIG. 12 shows the A-A ′ cross section of FIG. 11 in a state in which the leg gathering elastic material 55 is most contracted. The leg gathers 56 are formed in the absorbent main body 60 by the leg gathering elastic material 55. Further, the absorbent main body 60 has a top sheet 62 wider than the absorber 54 and narrower than the back sheet 61, and a three-dimensional gather expansion / contraction material 63 is disposed at both ends of the absorber 54. A three-dimensional gather 52 is formed.

  An absorptive main body can be manufactured as follows. First, an absorbent body wrapped in a hydrophilic sheet is disposed at the center in the width direction on the surface side of a long sheet material (back sheet material) that is a material for the back sheet. Next, a long sheet material (top sheet material) which is wider than the absorbent body and narrower than the back sheet material and is used as a top sheet material is laminated on the absorbent body. A laminate is obtained.

  Next, a three-dimensional gather is manufactured. First, the expansion / contraction material for solid gathers is arranged inside one end of the sheet material for solid gathers. Next, the end portions of the sheet material are folded back and pasted together so as to sandwich the three-dimensional gather elastic material. Next, the other end side of the sheet material is bonded to both end portions of the long laminate to obtain a three-dimensional gather. In addition, when sticking together, the elastic material for leg gathers is made into an expansion | extension state. A hot melt adhesive can be suitably used for fixing the stretchable material for three-dimensional gathers, fixing the stretchable material for leg gathers, and bonding the three-dimensional gathers to the long laminate.

  Next, a hook material for fixing the absorbent main body to the waistband is affixed to the surface on the back sheet side, which corresponds to both ends of the absorbent main body in the longitudinal direction of the long laminate. . Next, the long laminate with the hook material attached is cut at a predetermined position perpendicular to the length direction to obtain an absorbent main body. In addition, you may use what was manufactured by methods other than the said manufacturing method for an absorptive main body.

[2-3] (J) Process:
(J) The step is to fold the absorbent main body fixing body so that the absorbent main body is located inside, and the first end region of the first intermediate sheet overlaps the second end region of the second intermediate sheet. The first intermediate sheet and the second intermediate sheet are laminated so that the leg periphery forming part of the first intermediate sheet overlaps the leg intermediate forming part of the second intermediate sheet, and the leg periphery forming part It is a process of obtaining the laminated body for diapers which has a joining area | region ranging from a 1st end part area | region, and the joining area | region is arrange | positioned at predetermined intervals in the longitudinal direction.

[2-4] Step (K):
(K) A process joins the 1st intermediate sheet and 2nd intermediate sheet of the laminated body for diapers in a joining area | region, has a joining area | region at the predetermined interval in the longitudinal direction, and joins in a joining area | region. This is a step of obtaining a diaper assembly in which a portion is formed.

  The method similar to the method demonstrated by the (D) process mentioned above can be employ | adopted for the method of joining a 1st intermediate body sheet and a 2nd intermediate body sheet | seat. Specifically, a hot melt adhesive, a heat sealing method or the like, a method using welding with ultrasonic waves, or the like can be used. Moreover, you may join so that attachment or detachment is impossible, and you may join so that attachment or detachment is possible.

[2-5] Step (L):
(L) A process cut | disconnects a joining area | region with the locus | trajectory along the transversal direction of the joined body for diapers, and the absorptive main body fixed to this waist belt and the waist belt by which the junction part was formed in the both sides part. It is a process of obtaining a disposable diaper provided.

  As a method for cutting the bonding region, a conventionally known method can be adopted. For example, a cutting blade or the like can be used.

  In addition, although it is preferable to perform the manufacturing method of the disposable diaper of this invention in order of (G) process-(L) process, there is no restriction | limiting in particular in the order of each process. For example, the process ((A) process-(E) process) which manufactures a waist belt with the manufacturing method of the waist belt of this invention mentioned above is performed, Then, one end part and the other of the said absorptive main body are carried out to this waist belt. A disposable diaper can also be manufactured by fixing the ends of each.

  The method for producing a waist belt according to the present invention is suitable as a method for producing a waist belt for diapers for infants or adults such as elderly people and persons with disabilities who need care. Moreover, the manufacturing method of the disposable diaper of this invention is suitable as a manufacturing method of diapers for infants or adults, such as an elderly person and a disabled person who require nursing care.

10a, 10b: waist belt, 11: long sheet, 11a: one end of the long sheet, 11b: other end of the long sheet, 12: elastic material around the waist, 14, 14a, 14b: around the leg Stretch material 16, 16a, 16b: Leg circumference forming portion, 21: First end region, 22: Second end region, 23: Intermediate region, 23a: Leg stretch material installation region, 23b: First end Part side region, 23c: second end side region, 25: first intermediate sheet, 26: second intermediate sheet, 30a, 30b, 30c: stretchable sheet, 31a, 31b: joining region, 31a1, 31b1: Heat seal (joint part), 35: ventral sheet, 36: dorsal sheet, 37: perforation, 39: through hole, 40a, 40b: joined body, 42a: one end of joined body, 42b: joined body The other end, 44: waist 45: leg opening, 50: absorbent main body fixed body, 52: solid gather, 54: absorbent body, 55: elastic material for leg gather, 56: leg gather, 60: absorbent main body, 60a: absorbent One end of the main body, 60b: the other end of the absorbent main body, 61: back sheet, 62: top sheet, 63: stretchable material for three-dimensional gather, 100: disposable diaper, 116: end region around the leg, B : Division trajectory, M: intersection, S1, S2: continuous cutting trajectory.

Claims (10)

A method of manufacturing a waist belt for fixing an absorbent main body to a wearer's body,
Around the waist in a stretched state along the longitudinal direction of the long sheet on the first end region including one end of the strip-shaped long sheet in the short direction and the second end region including the other end Affixing an elastic material, and extending a plurality of stretchable materials around the legs in an intermediate region between the first end region and the second end region, along the longitudinal direction of the long sheet, Arranging so as to draw a wavy trajectory that does not intersect, and pasting at least a part thereof, the wavy leg elastic material installation region with the leg elastic material attached, the leg elastic material installation region and the first Step (A) for obtaining a stretchable sheet having a first end side region between the one end regions, and a second end side region between the leg stretchable material installation region and the second end region. When,
Continuous cutting along the longitudinal direction of the stretchable sheet so as to sequentially pass through the leg stretchable material installation region, the first end side region, the leg stretchable material installation region, and the second end side region in this order. A leg in which the stretchable sheet is cut in a trajectory, and the elastic material around the legs is intermittently attached in the longitudinal direction to the first end region and the region other than the first end region. The leg-around elastic material is affixed intermittently in the longitudinal direction to the band-shaped first intermediate sheet having a part for forming the periphery, the second end region, and the region other than the second end region. A belt-shaped second intermediate sheet having a leg-forming part formed (B),
The first end region of the first intermediate sheet overlaps with the second end region of the second intermediate sheet, and the leg periphery forming portion of the first intermediate sheet and the second intermediate body The first intermediate sheet and the second intermediate sheet are laminated so that the leg periphery forming portions of the sheet overlap to have a joining region extending from the leg periphery forming portion to the first end region. And (C) a step of obtaining a band-shaped laminate in which the joining regions are arranged at predetermined intervals in the longitudinal direction;
The first intermediate sheet and the second intermediate sheet of the obtained laminate are joined at the joining region, the joining regions are provided at predetermined intervals in the longitudinal direction, and the joining region is within the joining region. A step (D) of obtaining a belt-like joined body in which joint portions are formed, and a waist belt having the joint portions on both sides by cutting the joining region along a trajectory along the short direction of the joined body. And (E) obtaining a waist belt comprising :
The position of the continuous cutting locus is set to a position biased toward the other end side of the long sheet constituting the elastic sheet,
In the step (D), the joining portion of the joining region intersects with some of the elastic members around the legs and extends over the entire area of the first end region. The elastic sheet is formed by bonding the body sheet and the second intermediate sheet, and other elastic materials excluding the part of the elastic materials around the legs in the bonding area are arranged. A method for manufacturing a waist belt, wherein the first intermediate sheet and the second intermediate sheet are not joined to each other in a non-joined state .   The method for manufacturing a waist belt according to claim 1, wherein the wavelength and phase of the continuous cutting locus are the same as the wavelength and phase of the wavy locus drawn by any one of the leg-hole elastic members.   The method of manufacturing a waist belt according to claim 1, wherein the leg elastic members are arranged so as to draw a sinusoidal locus, and the continuous cutting locus is a sinusoidal curve.   The waist belt manufacturing method according to claim 1, wherein the continuous cutting locus is a linear locus parallel to a longitudinal direction of the stretchable sheet.   The portion other than the portion intersecting with the continuous cutting locus is attached to the long sheet without attaching the portion intersecting the continuous cutting locus of the leg stretchable material to the long sheet. The manufacturing method of the waist belt as described in any one of these.   The waist belt according to any one of claims 1 to 5, further comprising a step (F) of cutting the leg crossing elastic material after intersecting the continuous cutting locus after obtaining the elastic sheet. Production method.   The waist belt according to any one of claims 1 to 6, wherein a detachable first joint portion is disposed on one side of the adjacent joint regions, and a non-detachable second joint portion is disposed on the other side. Production method. Around the waist in a stretched state along the longitudinal direction of the long sheet on the first end region including one end of the strip-shaped long sheet in the short direction and the second end region including the other end Affixing an elastic material, and extending a plurality of stretchable materials around the legs in an intermediate region between the first end region and the second end region, along the longitudinal direction of the long sheet, Arranging so as to draw a wavy trajectory that does not intersect, and pasting at least a part thereof, the wavy leg elastic material installation region with the leg elastic material attached, the leg elastic material installation region and the first A step (G) of obtaining a stretchable sheet having a first end side region between the one end regions and a second end side region between the leg stretchable material installation region and the second end region. When,
Continuous cutting along the longitudinal direction of the stretchable sheet so as to sequentially pass through the leg stretchable material installation region, the first end side region, the leg stretchable material installation region, and the second end side region in this order. A leg in which the stretchable sheet is cut in a trajectory, and the elastic material around the legs is intermittently attached in the longitudinal direction to the first end region and the region other than the first end region. The leg-around elastic material is affixed intermittently in the longitudinal direction to the band-shaped first intermediate sheet having a part for forming the periphery, the second end region, and the region other than the second end region. (H) a step of obtaining a belt-shaped second intermediate sheet having a leg-forming part formed
An absorber, a top sheet that is arranged so as to cover the surface of the absorber, and at least partly made of a liquid permeable material, and a back sheet that is arranged so as to cover the back surface of the absorber. An end of the absorbent main body having a backsheet, which is disposed between adjacent leg-forming portions of the first intermediate sheet, and in the longitudinal direction of the absorbent main body. The other end is disposed between the adjacent leg periphery forming portions of the second intermediate sheet and fixed to obtain an absorbent main body fixing body (I),
The absorbent main body fixing body is folded so that the absorbent main body is located inside, and the first end region of the first intermediate sheet and the second end region of the second intermediate sheet overlap. The first intermediate sheet and the second intermediate sheet are laminated so that the leg periphery forming part of the first intermediate sheet and the leg periphery forming part of the second intermediate sheet overlap. (J) a step of obtaining a diaper laminate having a joining region extending from the leg-forming part to the first end region, wherein the joining region is arranged at a predetermined interval in the longitudinal direction;
The first intermediate sheet and the second intermediate sheet of the obtained laminate for diapers are joined at the joining region, and the joining region has the joining region at a predetermined interval in the longitudinal direction. (K) step of obtaining a diaper joined body having a joint formed therein;
A disposable comprising: a waist belt in which the joint area is cut along a trajectory along a short direction of the joined body for the diaper and the joint portion is formed on both side portions; and the absorbent main body fixed to the waist belt. A process for obtaining a diaper (L) , and a method for producing a disposable diaper comprising :
The position of the continuous cutting locus is set to a position biased toward the other end side of the long sheet constituting the elastic sheet,
In the step (K), the joining portion of the joining region intersects with some of the elastic members around the legs and extends over the entire area of the first end region. The elastic sheet is formed by bonding the body sheet and the second intermediate sheet, and other elastic materials excluding the part of the elastic materials around the legs in the bonding area are arranged. The manufacturing method of the disposable diaper which makes it a non-joining state about the field which did not join the 1st intermediate sheet and the 2nd intermediate sheet .   The method for manufacturing a disposable diaper according to claim 8, wherein the wavelength and phase of the continuous cutting locus are the same as the wavelength and phase of the wavy locus drawn by any one of the leg-surrounding elastic members.   The method for manufacturing a disposable diaper according to claim 8 or 9, wherein the leg stretchable members are arranged to draw a sinusoidal trajectory, and the continuous cutting trajectory is a sinusoidal curve.

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